How many replication forks are formed when an origin of replication is opened?
(a) 1
(b) 2
(c) 3
(d) 4
(b)
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Why did scientists originally believe that proteins, rather than DNA, were the molecules that directed protein synthesis?
A. Proteins were the more complex molecules in which genetic information could be stored. B. Proteins were more likely to have catalytic properties for synthesis reactions. C. At the time, more was known about the structure of proteins than that of DNA. D. Proteins were the same types of molecules as those that were being synthesized.
Gene expression leads to the production of which of the following?
a. RNA and protein b. DNA and RNA c. polypeptides and amino acids d. protein and polypeptides
The vascular transport tubes of plants are reinforced with
a. cellulose. b. chitin. c. rhizoids. d. mycorrhizae. e. lignin.
A positive effect associated with pesticide usage is
1.killing disease-causing insects. 2.killing some pathogens. 3.increasing food supplies. 4.increasing profits for farmers. 5.all of the choices